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Saudi Arabia on Tuesday executed 37 of its citizens convicted of terrorism, three years after another mass execution that ultimately led to a break in relations with Iran.

The latest executions were carried out in Riyadh, the Muslim holy cities of Mecca and Medina, the predominantly Sunni province of Qassim, and in the Eastern Province, home to the country’s Shiite minority.

The men were executed “for adopting terrorist and extremist thinking and for forming terrorist cells to corrupt and destabilise security”, said the official Saudi Press Agency (SPA).

It said one person was crucified after his execution, a punishment reserved for particularly serious crimes.

At least 100 people have been executed in Saudi Arabia since the start of the year, according to data released by SPA.

On Sunday, four men were killed in an attack on a security services base north of the capital Riyadh in an assault claimed by the jihadist Islamic State group.

Saudi authorities arrested 13 “terrorist” suspects the next day, but they did not say where the arrests took place or if they were linked to Sunday’s attack.

– ‘Sectarian strife’ –
The interior ministry said some of those executed Tuesday were accused of “inciting sectarian strife”, a charge often used in Saudi Arabia against Shiite activists.

The Eastern Province has seen bouts of unrest since 2011 when protesters emboldened by the Arab Spring took to the streets demanding an end to alleged discrimination by the Sunni-dominated government.

Although no official figures exist, Shiites make up an estimated 10-15 percent of the ultra-conservative kingdom’s 32 million population.

In January 2016, Saudi Arabia enraged Shiite Iran with the execution of prominent Shiite cleric Nimr al-Nimr, among a group of 47 people convicted of “terrorism”.